Refrigerating apparatus



Dec. 15, 1931. H. B. HULL I REFRIGERATING APPARATUS 2 Sheets-Sheet 1 Filed Nov. 27, 1929 4e I I A 0%EYS Dec. 15, 1931. B, H 1,836,073,

REFRIGERATING AP PAR ATUS 7 Filed Nov. 27, 1929 2 Sheets-Sheet 2 Arrazegys Patented Dec. 15, 1931 y UNITED STATES PATENT n=1|.-..

HARRY B. HULL, OF

DAYTON. OHIO, ASSIGNOB TOFRIGDAIRE CORPORATE) 01' DAY-- ION, OHIO, A CORPORATION" 01' DELAWARE aararenaar me arrm'rus Application filed November a1. 1929. Serial No. 41 0451.

This invention relates to refrigerating apparatus and more particularly to a refrigerating apparatus or s stem having a plurality of refrigerating sur aces which may be maintained at different temperatures.

An object of this invention is to provide a refrigerating system wherein different temperatures may be maintained in difierent evaporating sections without the use of'an m automatic valve in the suction side .of the system.

Another object of this invention is to provide a novel method of maintaining difierent pressures in different evaporators connected to the same compressor.

Further objects and advantages of the present invention will be apparent from-the following description, reference being had to the accompa-n ing drawings, wherem a preferred form of the present invention is clearly shown.

In the drawings: Fig. 1 is a view, somewhat diagrammatic, of a refrigerating system embodying features of this invention;

Fig. 2 is aview, also somewhat diagrammatic, of-another system; 4

Fig. 3 is a view, somewhat diagrammatic, of another system; Fig. 4 is a View, part1 in section, of a portion ofthe a paratus s own in Figs. 1 to 3 inclusive, an

Fig. 5 is an enlarged cross sectional view of a (portion of the apparatus shown in Figs.

Fig. 6 is a sectional view of either-of the goat fhambers of the evaporators shown in A refrigerating system embodying features of this invention may include a refrigerant low pressure side and a refrigerant high ressure side. A refrigerant liquefying umt -20 may transfer evaporated refrigerant from the low pressure side as liquid refrigerant to the high pressure side. I A plurality'of evaporating sections or evaporators 21, 22 may transfer liquid refrigerant from the high pressure side as evaporated refrigerant to the low pressure side. Thus a liilulid refri 23 may connect said re er'ant'line 24 connectingsaid refrigerant-liq tion, butis shown' here merely as the lower ;ent to B. G. Osborn1,556,708, patented Octorant line gerant iquefying unit 20 and said evaporators to form the refrigerant high pressure side. The low pressure side, may include an evaporated refriguefying unit 20 and at least one of said evaporators, such as evaporator 22, an evaporated v refrigerant branch 25 connecting said evaporated refrigerant line and at least another of 7 said evaporators, for instance evaporator 21 to form the refrigerant low pressure side.

,The evaporated refrigerant line 24 may-be provided with means or creating in said line a zone of lower pressure of the refrigerant than in the main portion of said line. Such means is generally indicated at 26, and the' branch 25 may connect the evaporator 21 with the zone heretofore described in means 26. Therefrigerant liquefying unit 2Q may be' controlled in accordance w1th condltions in the refrigerating system, and referabl I the unit may be controlled in accor ance wit pressures .of the expanded refrigerant. This ma beaccomplished by a pipe or connection a 27 eading from the line 24 to a control device 28 for controlling the operation of'the unit 20; 1 The refrigerant liquefying unit 20 may be of an suitable construction. Thus it may. inclu e a compressor 30 driven by an electric motor 31. The compressed refr' erant from the compressor 30 may be con ensed in a condenser 32, the lower portion of-which may be provided with a liguid refrigerant receiver, which may be 0 enlarged cross secsection 33 of the condenser 32. From the condenser 32 .or receiver 33 the li uid refrigs erant may be conveyed by the liquid refrifi; ant line 23 to the evaporators 21, 22. may be accomplished by providing branches 34 and 35 leading to the evaporating sections or'evaporators 21, 22 which eva orators-may. be of theflooded'type and pre erably of the 1 float controlled valve type shown in the patber 13,1925. A cross section of the float chambers of the evaporators'21, and 22 is shown in Fig.6. This fi re shows a needle valve 91 operated by the at ball92 to: admit suflicient liquid refrigerant from'the conduit 24 to the compressor and preferably to, the

' crank case 23 to maintain li uid refrigerant within the float chamber to e proper level as shown at 93. The vaporized refrigerant within the float chamber is .withdrawn through the outlet duct 94. Thus there is provided means for independently controlling the flow of refrigerant into said evaporating sections. The evaporated refrigerant may return to the lique g unit through the branch or branc es and evaporated refrigerant line as shown. 0 If the refrigerant liquefying unit 1s intermittent in operation, and electrically driven,

the motor 31 may be started and stopped by the control device 28 which may include the snap'switch 36 connected to an expansible chamber 37, which in turn may be connected [by the connection or pipe 27 with the expanded refrigerant, and preferably at the expanded refrigerant line 24.

he construction is such that a different pressure may be maintained, through at least a part of the operating time, in the evaporacompressor.

tors 21 and 22. Means 26 creates a zone of lower pressure of the, refrigerant in the line 24. This may be accomplished by any suitable means such as any constriction, jet or venturi construction. Thus the constriction may include a 'et 40 which may be part of the 'venturi 41. T is construction creates a zone at 42 wherein the pressure of the expanded e evaporators may be placed in any suitable containers. Thus as shown in Fig. 1 the eva orator 21 may be placed in an ice cream cabinet 50, which, if desired, may be a part of an ice cream soda fountain, and may contain suitable sleeves 51 for receiving the usual Evaporator 22 may be laced in a liquid 0001- ing compartment of t e fountain. Thus it;

dition of any freezing compositions.

food or ice cream containers. These sleeves be immersed in brine 52 placed in the brine tank 53 in a manner well known.

in the tank 54 without the adma be placed One -or more coils 55 may be immersed in the water for cooling the liquids such as drinking water, carbonated water, etc. generally used. in soda fountains.

Irr'the modification shown in Fig. 2, the

' evaporating sections may be. applied to what is ordinarily considered a singlecooling unit.

Thus the refrigerant liquefying unit 20a may deliver liquefied refrigerant to the cooling 60. The cooling unit 60 may include two or more surfaces or sections adapted to be maintained at different temperatures.

Thus an air cooling surface 61 may be provided and a freezing surface or section-62 may also be provided. The air cooling surface or section 61 preferably may be a spiral wound around, but spaced from thecooling surface or section 62. The surface 62 may also bea spiral'wound around and contacting with the surface 63 which may be an ice tray sleeve. The cooling unit 60 may be placed in insulatedfood compartment substantially in the manner shown in the Australian patent to Delco-Light Company, No. 10,380/27. The difference in temperature in the surface or sections 61 and 62 may be obtained by the use ofmeans 26a, similar to means 26 heretofore described. A single expansion valve 64, or independent valves for each of the surfaces :or sections 61, and 62 may be provided. If a single ex ansion valve 64 is provided, part of the re rigerant will, followpipe or section 61, and art will follow pipe orsection-62. Since tide means 26a produces a lower pressure in the pipe or section 62, the temperature in this pipe is lower than the temperature in pipe 61.

In order to insure a lower pressure in the pipe 62 a suitable construction 62 may be placed in the T' fitting 64' and leading to the pipe 62 which provides suflicient resistance or expansion to permit. a lower pressure in pipe 62. The fitting 64' may be sufficiently close to the valve 64 to be a part of the expansion means for the coil 62, thus providing means for independently controlling the flow of refrigerant into said pipe sections. In this modification the refrigerant liquefying unit 20a may be controlled by a thermostatically operated control device 280,, which may include snap switch 36a controlling the operation of the motor 31a. The expansible chamber 37 a operating switch 36a may be connected by a pipe, 27 a to a thermostatic bulb 65, which is responsive to conditions-in the refrigerating system, and preferably to temperature conditions in the sleeve 63.

In the modification shown in Fig. 3 the refrigerant liquefying unit 205 may discharge liquid refrigerant into the expansion valve 646 from whence the expanded refrigerant branches at the fitting'64' into P P The/construction 62 may lead to the pipe 62b. The pipe or evaporating section 615 may be used to cool food storage cabinet by means of the coil 7 .0, while the pipe or evaporating section 62b'maybe used to cool an ice cream cabinet in any suitable manner. Thus it may be branched into coils 71, 72 and 73 surrounding the sleeves 7 4, which are provided for the reception "of ice cream cans or or evaporating sections. 616 and 625.

' sired, be provided with a tank 75 and may be filled with brine,'or, if desired, the s ace may be filled with insulating materia so that the refrigerant of each sleeve is independent of the remainder of the sleeves. The branches 71, 72. and 73 may be joined into the branch 256 which leads to the device 266 similar to device 26 and from thence the refrigerant returns through the expand:

ed refrigerant line 24b. The motor 31?) mav be controlled by'a thermostatic device 286 including a snap switch 36b operated by an expansible bellows 37b which may be connected through the pipe 276 with a thermostatic bulb b conveniently placed in the brine tank 75.

Unless otherwise described, or as well understood from the inherent difference, the parts shown .in the different modifications operate substantially in the same manner. While the form-of embodiment of the invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows: 1. A refrigerating system comprising a refrigerant liquefying unit, a plurality of evaporating sections, a liquid refrigerant :line connecting said unit and said sections, an evaporated refrigerant line connecting said unit and one of said sections, means in said evaporated refrigerant line creating in said line a zone of lower pressure of the refrigerant than in the main portion of said line, and

an evaporated refrigerant branch connecting said zone and another of said sections.

2. A refrigerating system comprising a refrigerant liquefying unit, aplurality of evaporating sections, a liquid refrigerant line connecting said unit and said sections, an evaporated refrigerant line connecting said unit and one of said sections, means in said evaporated refrigerant line creating in said line a'zone of lower pressure of the refrigere ant than in the main portion of said line, and an evaporated refriglerant branch connectin' ating in said line a zone of lower pressure of the refrigerant than in the main portion of 7 said line, and an evaporated refrigerant branch connecting saidv zone and "another of saidi'section's.

4. A. refrigerating system comprising a refrigerant liquefying unit, Ta plurality of evaporating sections, a liquid refrigerant line connecting said unit and said evaporating sections, an evaporated refrigerant line connecting said unit and one of said evaporating sections, a venturi in said evaporated re-.

frigerant line creating in said line a zone of lower pressure ofthe refrigerant than in the main portion of said line, and an evaporated refrigerant liquefying unit, a plurality of evaporating sections, a liquid refrigerant line connecting said unit and sa1devaporating sections, means independently controlling the flow of refrigerant into said evaporating sections, an evaporated refrigerant line connecting said unit and one of said eva rating sections, means in said evaporate refrigerant line creating in said line a zone of lower pressure of the refrigerantthan in the main portion of said line, and an evaporated refrigerant branch connecting said zone and another of said evaporating sections.

6. A refrigerating system comprising a refrigerant liquefying unit, a plurality of evaporating sections, a liquid refrigerant line connecting said unit and said evaporating sections, means in said evaporating sections for independently maintaining a quantity of liquid refrigerant in said evaporating sections,'an evaporated refrigerant line connecting said unit and one of said evaporating sections, means in said evaporated refrigerant line creating in said line-a zone of lower pressure of the refrigerant than in the main portion of said line, and an evaporated re rigerant branch connecting said zone and another of said evaporating sections.

. 7, A refrigerating system comprising a refrigerant liquefying unit, a plurality of evaporating sections, a liquld refrigerant line said unit and said evaporatmg connectin sections, oat controlled Valves in said evaporating sections for inde endently maintaining a quantity of liquid refrigerant in said evaporating sections, an evaporated refrigerant line connecting said unit and one of said evaporating sections, means in said evaporated refrigerant line creating in said line a zone of lower pressure of the refrigerant than ,in the main ortion of said line, and an eva orated refrlgerant branch connecting sai' zone and another of said evaporating sections. p

8. A refrigerating system wherein refrigerant flows compris'in a refrigerant low pressure side, and. a re rigerant high pressure side, a refrigerant liquefying unit for transferring evaporated refrigerant in the low pressure side as liquid refrigerant to the high pressure side, a plurality of evaporating sections for transferring liquid refrigerant from the high pressure side as evaporated refrigerant 1n the low pressure. side, means utilizing' the flow of refrigerant for creatin different pressures in at least two of sai evaporating sections.

9.- A refrigerating system wherein refrigerant flows comprising a refrigerant low pres- .sure side, and a refrigerant hi h pressure connecting said unit and said evaporating side, a refrigerant liquefying umt for transferring evaporated refrigerant in the low pressure side as liquid refrigerant to the" high pressure side, aplurality of evaporating sections for transferring li uid refrlgerant from the high pressure si e as evaporated refrigerant in the low pressure slde,

means utilizing the flow of refrlgerant in the low pressure side for creating different pressures in atleast two of said evaporating sections.

10. A refrigerating system comprising a refrigerant liquefying unit, a plurality of evaporating sections, a liquid refrigerant line sections, anexpansion valve for controlling the supply of liquid refrigerant to said sections, an evaporated refrigerant line connectingsaid unit and one of said eva crating sections, means in said evaporate refrigerant line creating in said line a zone of lower pressure of the refrigerantthan 1n the main portionof said line, and an evaporated refrigerant branch connecting said. zone and-another of said evaporated sections.

11 A refrigerating system comprising a refrigerant liquefying unit, an inner evaporating section for creating a freezing zone, an outer evaporating section for coolin air,

a liquid refrigerant line connecting sai unit and said evaporating sections, means for controlling the supply of liquid refrigerant to said evaporating sections, an evaporated re- 7 frigerant line connecting said unit and the outer of said evaporating sections, means in said evaporated refrigerant line creating in said line a zone of lower connecting said zone and the inner of asaid evaporating sections. I

In testimonywhereof I hereto afix my signature.

B. HULL.

I ressure of the refrigerant than in the main portion of said line, and an evaporated refrigerant branch 

